Table 1.

Description of the Study Population by Questionnaire.

Group	All	IGRA positive	IGRA negative	*p value
		(QFT-GIT≥0.35 and/or T-SPOT≥6 spots)	(other than positive)
n	654	33 (5.0%)	621 (95.0%)
symptom	16 (2.4%)	1 (3.0%)	15 (2.4%)	NS
previous
abnormalities of chest	26 (4.0%)	11 (33.3%)	15 (2.4%)	p<0.05
X-ray and/or IGRAs
history of TB treatment	16 (2.4%)	10 (30.3%	6 (1.0%)	p<0.05
co-morbidity	17 (2.6%)	1 (3.0%)	16 (2.6%)	NS
history of TB
exposure within 2	19 (2.9%)	1 (3.0%)	18 (2.9%)	NS
years

Categorical variables were compared by the Pearson’s χ-squared test.

* p<0.05 was considered statistically significant. NS: not significant